Method of securing anchoring members in high-strength steel

ABSTRACT

In fixing anchoring members in high-strength steel members, such as securing bolts in railroad rails, a blind bore having a diameter slightly smaller than that of the diameter of the anchoring member, is formed in the high-strength steel member, then, after aligning the anchoring member with the blind bore, it is driven into the bore using an explosive charge to supply the driving force.

United States Patent [1 1 Ritter et al.

111 3,742,591 (451 July 3,1973

METHOD OF SECURING ANCHORING MEMBERS lN HIGH-STRENGTH STEEL Inventors: Adolf Ritter, Mauren; Karl Walser,

Waldteile,'both of Liechtenstein Assignee: Hilti Aktiengesellschaft Schann, Fuerstentum, Liechtenstein Filed: Nov. 23, 1970 Appl. No.: 91,803

Foreign Application Priority Data Dec. 8, I960 (iermuny ..l 196] 500.

US. Cl 29/525, 29/254, 227/10 Int. Cl 823p 19/02 Field of Search 29/42l E, 525, 254;

References Cited UNITED STATES PATENTS l2/l9l8 Mead .29/421 E UX 2,3l6,l l2 Temple 29/421 E X 3.()6l,834 l H1962 Temple ct al., 227/9 3,l8l,760 5/l965 Catlin et al. 227/10 FOREIGN PATENTS OR APPLICATIONS 494,597 lO/l938 Great Britain ..'29/5Z5 l ,336, l 47 7/ l 963 France 29/525 Primary Examiner-Charlie T. Moon Attorney-McGhw & Toren 57 1 ABSTRACT In fixing anchoring members in high-strength steel members, such as securing bolts in railroad rails, a blind bore having a diameter slightly smaller than that of the diameter of the anchoring member, is formed in the high-strength steel member, then, after aligning the anchoring member with the blind bore, it is driven into the bore using an explosive charge to supply the driving force.

2 Claims, 3 Drawing Figures PAIENIEDJULS m 3.742.591

SHEET 1 BF 2 F liq. 1

INVENTU ADOLF rune? KARL WALSER m a e/04764017.

ATTORN EYS PATENTED JUL 3 I975 SHEET 2 OF 2 INVENTO s ADOLF RITTE KARL WALSER A cj wEvs METHOD OF SECURING ANCHORING MEMBERS IN HIGH-STRENGTH STEEL SUMMARY OF THE INVENTION The present invention is directed to a method of securing anchoring members in high-strength steel members,'and particularly, it is directed to a process of atcostly.

In an alternative method the rails have been provided with bores and the conductor cable straps with cylindrically shaped copper collars which fit into the bores and then an expansion bolt is driven into the collar to secure it within the bore. This alternative method has the disadvantage that a large diameter bore is required which weakens the strength of the rail and, further, it has been found that a durable attachment of the cable strap cannot be insured using this method.

Therefore, the primary object of the present invention is to provide an economically feasible method of attaching conductor cables to railroad rails which is safe in all respects and overcomes the disadvantages previously experienced in effecting such connections.

In accordance with the present invention, initially, a blind hole is bored into the rail at the point at-which the cable is to be secured, preferably in the region of the rail web, then after aligning a threaded bolt with the blind hole, it is driven into the hole by means of an explosive-charge operated setting member. The hole is bored so that it is approximately three-tenths to fivetenths mm, and preferably four-tenths mm, less than the diameter of the bolt.

By means of the present invention the advantage is gained of using an economical explosive-charge bolt setting operation, although the strength of the rail steel is 70 to 80 kg/cm, that is, the steel strength is considerably higher than that which can normally be used with bolt setting members using an explosive charge for the driving force. The blind hole bored into the rail is desirable to prevent faulty indications in rail testers.

In accordance with the method of the present inven- I tion, it is possible to insure a safe current conduction between the threaded bolts and the rails as well as to provide an extraction value of about 2,000 kg by using a M10 threaded bolt which matches actual conditions and has a rounded or flattened front end and a cylindrical cross-section, and, further, where the shank diameter of the bolt is 5.3 mm and is driven into a blind bore having a diameter of 5 mm.

In drilling the hole or bore in the web of the rail, a known drill holding device with acentering stop is used. To facilitate the axial alignment of the bolt in the explosive charge actuated setting member with the blind bore, the centering stop or sleeve is simply removed from the drill holding device and the barrel of the setting member is inserted into the opening in the The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its 0perating advantages and specific objects attained by its uses, reference should be had to the accompanying drawing and descriptive matter in whichthere is illustrated a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWING In the Drawing:

FIG. 1 is a sectional representation of the drilling operation in accordance with the present invention;

FIG. 2 is a sectional representation of theanchoring member setting operation in accordance with the present invention; and

FIG. 3 is a sectional view illustrating a bolt driven into the railroad rail with a cable strap fully fastened to the rail by means of the bolt.

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, a railroad rail 1 supports a drill holding device 2, the device 2 consists of an inverted U-shaped clip 2a which presses a centering chuck 2b against the web 1a of the rail. In the first step of the method according to the present invention, a drill 3 driven by a commercial drilling machine, not shown, is guided in a centering sleeve or stop 4 positioned within the centering chuck 2b.

After the completion of the blind bore 5, note FIG. 2, the centering sleeve 4 is withdrawn from the centering chuck and its place is taken by the front barrel por tion 6a of a setting member 6 which is securely held within the centering chuck. By firing an explosive charge within the setting member, a bolt 7 is driven into the blind bore 5. In FIG. 3 the bolt is shown fully inserted and secured within the rail web 1a with the current-carrying cable strap 8 securely mounted on the bolt between a pair of washers 9 held in place by a nut 10 threaded on the bolt.

It can be appreciated that the method of the present invention is not limited to the securement of anchoring members into railroad rails, but can be utilized wherever there is a problem of making attachments to highstrength steels.

What is claimed is:

1. A method for driving and securing an anchoring member into a high-strength steel member, said method comprising the steps of drilling into said steel member a blind bore having a diameter which is slightly smaller than the diameter of said anchoring member to be inserted, aligning said anchoring member with said blind bore, positioning an explosive charge relative to said anchoring member in a location for driving said anchoring member into said blind bore, and detonating said explosive charge to drive said anchoring member into said blind bore.

2. A method according to claim 1, wherein said anchoring member is a bolt having a cylindrical shank and a flattened end, with said cylindrical shank having a diameter between 5 to 6mm., and wherein said blind bore is formed with a depth of between 10 'to 12 mm. and with a diameter of between three-tenths to five-tenths mm. less than the diameter of said anchoring member. 

1. A method for driving and securing an anchoring member into a high-strength steel member, said method comprising the steps of drilling into said steel member a blind bore having a diameter which is slightly smaller than the diameter of said anchoring member to be inserted, aligning said anchoring member with said blind bore, positioning an explosive charge relative to said anchoring member in a location for driving said anchoring member into said blind bore, and detonating said explosive charge to drive said anchoring member into said blind bore.
 2. A method according to claim 1, wherein said anchoring member is a bolt having a cylindrical shank and a flattened end, with said cylindrical shank having a diameter between 5 to 6mm., and wherein said blind bore is formed with a depth of between 10 to 12 mm. and with a diameter of between three-tenths to five-tenths mm. less than the diameter of said anchoring member. 